A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.
2
votes
3answers
176 views
How to handle layers with different Spatial references in ArcGIS Runtime SDK WPF?
I am currently writing the "Zoom to Layer" function for my application. However, the spatial references between my imported layer and my base map is different?
Is there a way around this? Can I some ...
0
votes
2answers
43 views
Thiessen Polygons and Coordinate Projections
I am trying to perform a Thiessen Polygons analysis in ArcGIS 10.
My DEM is in GGRS_1987 and the point set I downloaded from Google Earth is in WGS_1984. The points display correctly but when I run ...
2
votes
1answer
68 views
geocoding addresses specifically into NAD1983 or converting X,Y into 1983 after geocoding
I'm going bananas trying to geocode addresses into a NAD1983.
I have ArcMap 10.1 and I'm using the default address locator (North American 10.0 from arcgis online). No matter how low I set the ...
1
vote
1answer
31 views
When is a projected length calculated via a pythagorean distance more accurate than an ellipsoidal length?
I'm using spatialite 3.0.1 with the following test data (in EPSG: 4326):
Name astext(geometry)
---------- --------------------
Belitsa POINT(23.563 41.947)
Malko Tarn POINT(27.533 ...
1
vote
1answer
156 views
Is it possible to convert data from WGS84 to Bessel1841?
When we convert data from bessel1841 to WGS84, parameter setting must be used because it is impossible automatic convert on QGIS.
Reference: Converting shp file from bessel1841 to WGS84
Is it ...
1
vote
1answer
101 views
How to determine Earth co-ordinates?
I just read about latitudes and longitudes. I read latitudes are imaginary lines that run around the earth and longitudes are lines that run around from top to bottom.
Using this system:
1. ...
1
vote
1answer
226 views
What datum (reference ellipsoid) does Nasa Worldwind use?
What datum (reference ellipsoid) does Nasa Worldwind use?
I can't seem to find where Nasa Worldwind tells explicitly what datum they use. I need some sort of valid link.
0
votes
1answer
27 views
How can I find the SRID from the WKT out of a GRIB file?
I have a grib2 file which I'm trying to import into PostGIS 2.0 Raster and process. Trouble is, I can't figure out what the SRID is supposed to be, or one close enough for government work. Running ...
9
votes
0answers
449 views
ArcGIS Length and Area Calculation Scenarios
Trying to get a handle on how length and area are calculated in different scenarios in ArcGIS. I don't know why I can't find a answer on the feature class fields, but I can't find a precise answer, ...
4
votes
0answers
195 views
Can GeoTools parse GML CRS definitions?
A kind of branching of this question.
Soon I will need to handle GML Coordinate Reference Sysyem definitions in a Java servlet. Links:
GML OGC reference.
Concrete example.
I know that GeoTools ...
3
votes
0answers
50 views
How can I specify a spatial reference system which has a north pole different than the standard north pole?
I have a geographic spatial reference system (i.e., latitude and longitude) which has a north pole that is not the usual north pole: it's the magnetic north pole at approximately 70.30 degrees north, ...
3
votes
0answers
304 views
How to detect MGRS/UTM zone?
I posted a similar question on StackOverflow, but I thought I'd check here as well.
I am developing an open-source library for converting between coordinate systems, and I've run into a wall.
I want ...
2
votes
0answers
135 views
Coordinate systems conversion
I have the following task.
This is my sample data.
WGS84 datum (longitude/latitude):
-123.75 36.59788913307022
-118.125 40.97989806962013
Spherical Mercator (meters):
-13775786.985667605 ...
2
votes
0answers
225 views
PostGIS: ST_Transform function conversion problem
I'm inserting map data from a GML file with srid EPSG:27700 into a PostGIS database table with srid EPSG:4326. I'm using the ST_Transform function as in this snippet:
...
2
votes
0answers
140 views
How to decode Magellan URL coordinates to lat/lon
Magellan uses this URL to designate a coordinate in New York:
mgn:///address/?coord=merwFvlqbM,name=Viva%20Herbals%20Pizzeria,number=179,street=2nd%20Avenue,city=New%20York,country=US
How can I ...
2
votes
0answers
88 views
When using OpenLayers plugins maps, can I have Longitude/Lattitude labelled on my grid when using the Map composer in QGIS?
Using OpenLayers plugins maps, can I have Longitude/Latitude labelled on my grid when using the Map composer in QGIS?
2
votes
0answers
97 views
Changing CRS crashes QGIS every time
When I open QGIS, and use the tools, setting -> project properties, QGIS will crash.
When I also use the setting -> option -> CRS , Select new CRS also causes a crash.
It looks like couldn't use the ...
1
vote
0answers
21 views
How to identify grid shift file used by osgeo in Python?
I wrote a Python script reprojecting points from a source coordinate reference system (SCRS) to a target one (TCRS) both identified by an EPSG code.
I would like my python script to retrieve details ...
1
vote
0answers
97 views
Adding X,Y data and viewing with existing shape file
Excuse me for a simple question. I have CSV files of X,Y data (in decimal degrees) that I want to add to a map and view with a shapefile of level III ecoregions that I downloaded from the USGS ...
1
vote
0answers
59 views
Coordinate system for map downloaded Digimap?
I have download a 1: 25000 map from Digimap. It came as a tif file along with a tfw file. When I try to import the tif file as a raster layer, I get the following message: 'this layer appears to have ...
1
vote
0answers
105 views
Natural Earth: How to get the position of each country?
I've just split the 1:10m Natural Earth countries into individual JSON files which I plan to render and partially stitch back together using RaphaelJS. The 1:10m map is very big (10mb or so) so ...
1
vote
0answers
310 views
Importing GPS coordinates correctly
I am importing a gsx set of waypoints with lat/lon taken in degrees, minutes, and thousandths of a minute. When they are added to my project, the waypoints are not showing up correctly - the ...
1
vote
0answers
189 views
ogr2ogr failed to reproject shapefile error exceeds limits
I cannot get correct transformation from WGS84 to the Hungarian EOV EPSG:23700 (Hungarian Datum 72) using ogr2ogr.
I am using ogr2ogr from the fwtools shell. I have a shapefile in GCS WGS84 (epsg ...
1
vote
0answers
176 views
Create IPoint with Lat/Long in decimal degrees and Z in feet
I have written an ArcMap v10 AddIn that reads a folder of geotagged JPEG's and creates a new feature class where each point is the geotag information from on of the JPEG's. The issue is:
The GPS ...
1
vote
0answers
222 views
Spatial Reference and Area/Length Attributes relationship
I currently allow users to add a shape file in. From the shape file, allow the user to generate a new layer base on the polygons from the shape file's polygon they imported.
Generating the new ...
0
votes
0answers
15 views
Convert DHDN Bessel 1841 to latitude/longitude
I have a list of map coordinates, (x,y) e.g.
(526474.00000, 818507.00000)
(528517.00000, 817887.00000)
How can I convert these to latitudes and longitudes?
I tried looking at them with this ...
0
votes
0answers
15 views
Geoprocessing tool not executing when Map's SpatalReference is Web Mercartor
I am facing a strange issue when trying to execute GP service when my map's spatial-reference is Web Mercator. I appreciate all help.
I have a JavaScript API application. Initially I only had my map ...
0
votes
0answers
19 views
Switching between different feature sets / Change orientation of Openlayers Map
Setup
Entities postgis table:
id | name | the_geom | campus_id
1 | bldg_1 | <b1_geom> | 1
2 | bldg_2 | <b2_geom> | 2
3 | bldg_3 | <b3_geom> | 1
4 | bldg_4 | ...
0
votes
0answers
16 views
Program to read Microstation CRS definition file (.dty)?
Are the other programs/tools (beside MicroStation) that can read MicroStation coordinate system definitions stored in .dty files? It seems to be a binary only storage format and I can't decipher it ...
0
votes
0answers
36 views
Default CRS in QGIS isn't applied to new layers
I've set my CRS settings in QGIS to to use OSGB (EPSG:27700) wherever possible.
However when I create a new shapefile layer this setting is not applied and I have to manually select the CRS.
...
0
votes
0answers
59 views
What kind of unit of measurement for scale does SQL Server 2012 Spatial use?
What kind of unit of measurement for scale does SQL Server 2012 Spatial use?
0
votes
0answers
93 views
How to represent clustering of geographical points on map in STATA?
I've plotted a map on STATA using user-written program spmap and have also obtained the grid for my space using spgrid program. Now I want to see where most of my data points are clustered on map. Is ...
0
votes
0answers
51 views
What's the difference between CRS 4326 , CRS 4978 and CRS 4979?
They are all based on WGS84. 4326 is called "geographic 2D", 4978 is called "geocentric", 4979 is called "geographic 3D".
What are the differences between these three?
Why are we using "geographic ...
0
votes
0answers
64 views
How do I determine programmatically what values to add to the proj4js constructor for a CRS or SRS such that I can iteratively render proper overlays
I think this is primarily a GIS based question as far as for example:
var crs = L.CRS.proj4js('EPSG:2154',
'+proj=lcc +lat_1=49 +lat_2=44 +lat_0=46.5 +lon_0=3 +x_0=700000 ...
0
votes
0answers
62 views
Coordinates move in sql server insert
When I insert a row in TableA in sql server I use this for the geometry column:
geometry::STPolyFromText('POLYGON((x1,y1,x2,y2,x3,y3,x4,y4,x1,y1))', 3007)
You can find the definition for ...
0
votes
0answers
91 views
In Geoserver, Using as a Data Store the Web Feature Server option, but I have a serious problem
I’m using as a Data Store the Web Feature Server option, but I have a serious problem, because Geoserver needs to know what Coordinate Reference System of my data. This information is used for ...
